My husband has been given money in secret (from me) to his mother and sister for the last few years. I don't blame my husband completely. His mother is constantly asking him for money and he feels obliged to give it and feels too embarrassed to ask me or admit that she is putting him under so much pressure. I found out last year when I overheard his mother and sister talking about it and trying to hide the cash when they were leaving and since then I have come across many clues including large cash sums being taken out just before they arrive or we visit. I approached him about it last year and told him it is a lack of respect (because they all are under the impression that I don't know) and a lack of trust between him and myself. I have kept quiet up to now because I sometimes feel these discussions are far too upsetting and I have a thousand other more important worries to deal with at the moment. But I was wondering whether you thought it would make sense just to write a WhatsApp to my sister-in-law explaining that I actually do know about it, that I know that they think I don't, that it has the potential to cause a significant rift between my husband and I and our marriage and that although I love them I don't like what they are doing. This behaviour is very typical of my mother-in-law - I have seen her do similar things to others and she also keeps it all from my father-in-law who sees nothing of the money.